Progress: Continue re-designing of the memory logic.

Progress: Continue re-designing of the memory logic.

I did a first pass through the f_thread related memory code.
There could be a second pass through the f_thread, but for now this is good enough.

I spent some time going through the build process and other such code to get unit tests running with the latest progress commits.

Fix mistake in f_file_stream_read() where F_none_eof is returned but F_none should be returned.

Include cleanup commit f6725366474492f1b7baabba7938854f6e6412eb from 0.6 branch.